Improvement in bed-plates for paper-mill engines



UNITED STATES PATENT OFFICE.,

encuen A. consce, or nntcnsfrna, MASsAcHUSErTs, Assicnon 'ro Huisnr-,ttI AND ANTHONY nANKnv.

IMPROVEMENT IN BED-PLATES FOR PAPER-MILL ENGINES.

Specification forming part of Letters Patentv No. 43,070, dated June 7, 1864.

To ali whom tt may concern Be it known that I, GEVORGEVA. CoRsER, of Leicester, in the countyof Worcester and- State of Massachusetts, haveinvented certain new and. usefulImprovements in Bed-Plates for Paper-Mill Engines 5` and I dohereby declaro that the iollowing is a full, clear, and ,exact description 4ot the construction and operation of rthe same, reference being hadto the accompanying drawings, in which-'" Figures l and 2 represent perspective views of' my said improved bedpl-ate. Fig. 3 represents a cross-section through the same. v Fig.

4 represents a top vie-w of al bed-plate, hereinaiter to bc referred'to.

The nature vot' my inventionconsists in the production of an angular bedplatc for papermill engines, which will permit the stock to enter and leave the same in an even and uniform manner, and rwithout causing undue wear upon 'any particular point thereof.

In the application of angular bedplates to papermiil engines the diieulty occurs that the stock is crowded into the angles of the converging plates, where, owing to its accumulation, the plates are worn out-at these points and the stock passes in bunches. In the old angular elbow-plate the plates thus wear out at their centers, and to remedy this various improvements thereon were made-sueh, for instance, as the construction of a zigzag arigular plate, (representedin red lines at Fig. 4,) but in that plate the stock is crowded into each angle atie, and conseqnentlywearsthe plates out in these places, causing the stock,

to pass out in bunches. These diticulties are entirely obviated in my bed-plate, in which I4 use two sets ot' angular platesiirmly secured together, and which plates are arrangedin such a manner that the angles of one set are inverted in relation' to the angles of the other S t.

Toenable others skilled in the art to make and use my invention, I will proceed tov de scribe its construction and operation.

b represents a number of elbow or -angular plates, made of steel, andhaving an angular bend atfor near their centers; or each plate may be made ot' two straight pieces, which are set toward each other at an obtuse angle.

shown atxg, and a wood filling, h, is inserted between each two consecutive plates, so as 'to keep .those plates separated. The angular plates and wood fillings are securely fastened together by mea-ns of two outside plates, A,

and screw-bolts B, and thus constitute a" solid' bed-plate.

In using the bed-plate the wood fillings h .wear away, leaving the upper edges of theV steel plates sharp, with a clear space between each consecutive plates, which,in conjunction,

with the revolving cutting cylinder, reduce the stock te pulp.

By reference to Fig. l'it will Abe noticed -that the stock in coming 'in contact (inthe direction lot' the arrows) with the plates .1), which diverge toward the ends of the'bedplate, is spread toward said ends, butin passing said plates Z1 and in coming` in'contaet with the plates c, which converge toward the center, it is crowded to the same extent toward said center, and the result is that the stock will leave theJ plates c at or very'near at the same point from 'the center where it en'- tercd 'the plates b, and it is thus worked in A an even and uniform manner through the en tire plate without causing undiic wear on any particular point thereof. f

Fig. 2 represents a modifiedarrangement ot' angular plates in which' tlic same principle as above explained iscarried out, the angles of one set of plates' being inverted toward those ot the other set, and the result of the operation is the same.- 4

Having thus fully described the nature ot' my invention, what I claim herein as new, and desire to secure by Letters Patent, is`

1. An angular bed-plateforworliingpapenstock, composed ot' two or more sets ot' ange` lar plates, when said plates are arranged in."

such a manner that the angles .of the adjoining sets are inverted in 'relation to each other,

substantially in the manner and yfor the purposes described.

2. The combination of the angular inetal scribed, ofthe parallel side plates, A A, inthe plates b c, as herein arranged, and wooden manner and for the purpose herein set forth. iillings h with the side plates,A arranged in 1 relation to each other, substantially as and GEORGE A COLSIJ" for the purposes set forth.

3. The combination, with the angular plates for paper-engines, arranged as herein de- Witnesses:

THos. H. DODGE, J. HENRY HILL. 

